I haven't read all the replies. What I did when I made the mistake, once (and only once) of letting my Dobes run on a tennis court, was bag balm the feet and put baby socks on. It does take awhile to heal. You can let them air during the day and wrap at night. You can also use antibiotic cream.
With any kind of cut or abrasion, as my vet said (and MDs too) if you have to use peroxide, use only once.